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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c52d4687889f6d84f3010a2880a57c1f3f8b0d570fb359271b753f7a2a2a644' 
  AND token = 'lQUspgObZBMR0hYC0kbirEr4UY+IA6h6aweoQlU0f9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}